Python network programming test-host response

On the last day of the May Day holiday, write the code at will. First, the last small server responds to the UDP request.

Because I only have one machine, I use the lo0 port and set the socket to SO_REUSEADDR.

Server:
[Python] # test of host
 
Import sys, socket, traceback, time
 
Host =''
Xport = sys. argv [1]
 
Try:
Port = int (xport)
Failed t ValueError:
Port = socket. getservbyname (xport, 'udp ')

S = socket. socket (socket. AF_INET, socket. SOCK_DGRAM)
S. setsockopt (socket. SOL_SOCKET, socket. SO_REUSEADDR, 1)
S. bind (host, port ))
 
Print ('Waiting for a client ...')
 
While True:
Try:
Message, address = s. recvfrom (1024)
If (message = 'time \ n '):
Print ('get a client request for time ...')
S. sendto ('reply: '+ time. ctime (), address)
Elif (message = 'Hi \ n') or (message = 'Hello \ n ')):
Print ('get a client from: ', address)
S. sendto ('reply: hi client', address)
Else:
Print ('get a client from: ', address)
S. sendto ('What wocould you need? ', Address)
Except T (KeyboardInterrupt, SystemExit ):
Raise
Except t:
Traceback. print_exc ()
# Test of host

Import sys, socket, traceback, time

Host =''
Xport = sys. argv [1]

Try:
Port = int (xport)
Failed t ValueError:
Port = socket. getservbyname (xport, 'udp ')
 
S = socket. socket (socket. AF_INET, socket. SOCK_DGRAM)
S. setsockopt (socket. SOL_SOCKET, socket. SO_REUSEADDR, 1)
S. bind (host, port ))

Print ('Waiting for a client ...')

While True:
Try:
Message, address = s. recvfrom (1024)
If (message = 'time \ n '):
Print ('get a client request for time ...')
S. sendto ('reply: '+ time. ctime (), address)
Elif (message = 'Hi \ n') or (message = 'Hello \ n ')):
Print ('get a client from: ', address)
S. sendto ('reply: hi client', address)
Else:
Print ('get a client from: ', address)
S. sendto ('What wocould you need? ', Address)
Except T (KeyboardInterrupt, SystemExit ):
Raise
Except t:
Traceback. print_exc ()

Client:

[Python] # test of udp
 
Import sys, socket
 
Host = sys. argv [1]
Xport = sys. argv [2]
 
S = socket. socket (socket. AF_INET, socket. SOCK_DGRAM)
 
Try:
Port = int (xport)
Failed t ValueError:
Port = socket. getservbyname (xport, 'udp ')
 
Try:
S. connect (host, port ))
 
Print ('input the data ')
Data = sys. stdin. readline ()
S. sendall (data)
 
Failed t socket. error, e:
# Test of udp

Import sys, socket

Host = sys. argv [1]
Xport = sys. argv [2]

S = socket. socket (socket. AF_INET, socket. SOCK_DGRAM)

Try:
Port = int (xport)
Failed t ValueError:
Port = socket. getservbyname (xport, 'udp ')

Try:
S. connect (host, port ))

Print ('input the data ')
Data = sys. stdin. readline ()
S. sendall (data)

Failed t socket. error, e:
Start two terminals for testing:

The client inputs and obtains the Server Response (UDP ):

 

Server display:

 

 

 

 

OK. There are some summary at the end.

1. KeyboardInterrupt interrupt processing. The solution on win32 is different from that on Linux or UNIX.

2 use try... finally code block to close socket

3. Tips for using Python shell to query socket options (it feels a bit like SQL)








From the column of FishinLab